/*
 * Copyright 2004-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springmodules.validation.util.fel;

/**
 * Represents a single argument function. The function evaluates the argument and outputs
 * the evaluation result.
 *
 * @author Uri Boness
 */
public interface Function {

    /**
     * Evaluate the function on the given argument and return the evaluation result.
     *
     * @param argument The argument to the function.
     * @return The evaluation result
     * @throws FelEvaluationException thrown when the evaluation fails.
     */
    Object evaluate(Object argument) throws FelEvaluationException;

}
